Abstract #510
Section: Ruminant Nutrition (orals)
Session: Ruminant Nutrition VII
Format: Oral
Day/Time: Wednesday 10:15 AM–10:30 AM
Location: Room 300 CD
Session: Ruminant Nutrition VII
Format: Oral
Day/Time: Wednesday 10:15 AM–10:30 AM
Location: Room 300 CD
# 510
Production effects of extruded soybean meal in early lactation cow diets.
M. T. Harper*1, J. Oh1, A. Melgar1, K. Nedelkov2, S. Räisänen1, X. Chen3, C. M. M. R. Martins4, M. Young1, T. Ott1, D. M. Kniffen1, R. Fabin5, A. N. Hristov1, 1The Pennsylvania State University, University Park, PA, 2Trakia University, Stara Zagora, Bulgaria, 3College of Pastoral Agriculture Science and Technology, Lanzhou University, Gansu, China, 4School of Veterinary Medicine and Animal Science, University of Sao Paulo, Pirassununga, Brazil, 5Fabin Bros. Farms, Indiana, PA.
Key Words: extruded soybean meal, dairy cow
Production effects of extruded soybean meal in early lactation cow diets.
M. T. Harper*1, J. Oh1, A. Melgar1, K. Nedelkov2, S. Räisänen1, X. Chen3, C. M. M. R. Martins4, M. Young1, T. Ott1, D. M. Kniffen1, R. Fabin5, A. N. Hristov1, 1The Pennsylvania State University, University Park, PA, 2Trakia University, Stara Zagora, Bulgaria, 3College of Pastoral Agriculture Science and Technology, Lanzhou University, Gansu, China, 4School of Veterinary Medicine and Animal Science, University of Sao Paulo, Pirassununga, Brazil, 5Fabin Bros. Farms, Indiana, PA.
The objective of this experiment was to evaluate the productive and reproductive effects of replacing solvent extracted soybean meal (SSBM) with extruded soybean meal (ESBM) in a total mixed ration for early lactation cows. Thirty-four Holstein cows (12 primiparous and 22 multiparous) were used in a randomized complete block design experiment with 17 cows per treatment. Feeding was ad libitum for 5 to 10% refusals. A fresh cow diet was fed the first 14 d DIM followed by a lactation diet from 15 to 60 DIM. The SSBM lactation diet consisted of (DM basis): 33% corn silage, 14% alfalfa haylage, 5% hay/straw, 12% SSBM and 36% concentrates. In the ESBM diet, ESBM replaced SSBM. Lactation SSBM and ESBM diets were 18.9 and 18.8% crude protein, 28.3 and 28.0% neutral detergent fiber, and 3.3 and 4.2% ether extract, respectively. Enteric CH4 emission was measured using the GreenFeed system. Data were analyzed using the MIXED procedure of SAS. Milk yield (45.9 kg/d; SEM = 0.81), DM intake (22.4 kg/d; SEM = 1.18), and feed efficiency (FE; 2.06 kg/kg milk; SEM = 0.07) were not different between treatments (P ≥ 0.32). Energy-corrected milk (ECM) yield (47.6 vs 44.9 kg/d; SEM = 1.11, P = 0.09) tended to be higher for SSBM but ECM FE was not different. Treatments did not affect milk urea N, or milk components except for milk true protein yield, which was greater (1.40 vs 1.31 kg/d; SEM 0.06, P = 0.04) for SSBM. Concentrations of milk fatty acid (FA) ≥ 18C and trans FA, specifically trans 10 C18:1, were increased (P ≤ 0.02) in ESBM. Treatment did not affect blood cell counts or nonesterified FA and β-hydroxybutyrate concentrations. Milk progesterone concentrations did not reveal any differences in onset of 1st or 2nd luteal phases (LP) after calving, length of 1st LP, or interval between 1st and 2nd LP. Enteric CH4 emission (394 g/d; SEM 19.1), CH4 yield (14.8 g/DMI; SEM = 0.72) and CH4 intensity (7.9 g/kg milk; SEM = 0.48) were not affected by treatment. ESBM did not improve lactational or reproductive performance of early lactation dairy cows and decreased ECM and milk protein yields, possibly due to higher unsaturated FA intake compared with SSBM.
Key Words: extruded soybean meal, dairy cow
